Zobrazeno 1 - 10
of 17
pro vyhledávání: '"Mursula, K. (K.)"'
Hale cycle in solar hemispheric radio flux and sunspots:evidence for a northward-shifted relic field
Autor:
Mursula, K. (K.)
Context: Solar and heliospheric parameters occasionally depict notable differences between the northern and southern solar hemisphere. Although the hemispheric asymmetries of some heliospheric parameters vary systematically with the Hale cycle, this
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::8932109f841da899a61ab241c65fd265
http://urn.fi/urn:nbn:fi-fe2023052346512
http://urn.fi/urn:nbn:fi-fe2023052346512
Autor:
Virtanen, I. O. (I. O. I.), Pevtsov, A. A. (A. A.), Virtanen, I. I. (I. I.), Mursula, K. (K.)
Context: The evolution of the photospheric magnetic field can be simulated with surface flux transport (SFT) simulations, which allow for the study of the evolution of the entire field, including polar fields, solely using observations of the active
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::516815805090f2915fcbe518b1a98530
http://urn.fi/urn:nbn:fi-fe2021102151950
http://urn.fi/urn:nbn:fi-fe2021102151950
Autor:
Holappa, L. (L.), Robinson, R. M. (R. M.), Pulkkinen, A. (A.), Asikainen, T. (T.), Mursula, K. (K.)
The dynamics of substorms are known to be dominated by the North-South (Bz) component of the Interplanetary Magnetic Field (IMF), which is the most important driver of the dayside reconnection. Even though the dawn-dusk (By) component is also known t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::7ef5d2e42593b2e8b7e82b45cd46fa3c
http://urn.fi/urn:nbn:fi-fe2022021819790
http://urn.fi/urn:nbn:fi-fe2022021819790
The most important driver of geomagnetic activity is the north–south (\(B_z\)) component of the interplanetary magnetic field (IMF), which dominates the solar wind-magnetosphere coupling and all solar wind coupling functions. While the east–west
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::17f6bd783fcb14728e9bb19fc521d2ce
http://urn.fi/urn:nbn:fi-fe2020050625420
http://urn.fi/urn:nbn:fi-fe2020050625420
Two sequences of five high‐speed solar wind stream/corotating interaction region (HSS/CIR) events were observed at 1 AU in December 2007–2008. These two HSS/CIR sequences had opposite magnetic polarities, and they originated from two persistent l
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::8cfe2a27e7fd520b8f10c8e8ca520eb9
http://urn.fi/urn:nbn:fi-fe202002064706
http://urn.fi/urn:nbn:fi-fe202002064706
Energetic electron precipitation (EEP) affects the high‐latitude middle atmosphere by producing NOₓ compounds that destroy ozone. Earlier studies have shown that in the wintertime polar stratosphere, increased EEP enhances the westerly wind surro
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::574324fa2ebb6dae145e8465e8177293
http://urn.fi/urn:nbn:fi-fe2019061420601
http://urn.fi/urn:nbn:fi-fe2019061420601
Context: During solar minima the spatial power spectrum of the photospheric magnetic field is dominated by the low-degree zonal (axisymmetric; m = 0) harmonic components, reflecting the large polar coronal holes of unipolar magnetic field. However, m
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::2cd16566e342562cec8d9feaaf1a48df
http://urn.fi/urn:nbn:fi-fe2019040911600
http://urn.fi/urn:nbn:fi-fe2019040911600
Autor:
Virtanen, I. O. (I. O. I.), Virtanen, I. I. (I. I.), Pevtsov, A. A. (A. A.), Mursula, K. (K.)
Context: The axial dipole moments of emerging active regions control the evolution of the axial dipole moment of the whole photospheric magnetic field and the strength of polar fields. Hale’s and Joy’s laws of polarity and tilt orientation affect
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::92ed0b6321940b5cb93e60fd050f938e
http://urn.fi/urn:nbn:fi-fe202001142072
http://urn.fi/urn:nbn:fi-fe202001142072
The most important parameter in the coupling between solar wind and geomagnetic activity is the Bz‐component of the interplanetary magnetic field (IMF). However, recent studies have shown that IMF By is an additional, independent driver of geomagne
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::8b8f36e31cd7655883c94f94bcb8e3ce
http://urn.fi/urn:nbn:fi-fe2019091728507
http://urn.fi/urn:nbn:fi-fe2019091728507
Autor:
Virtanen, I. O. (I. O. I.), Virtanen, I. I. (I. I.), Pevtsov, A. A. (A. A.), Mursula, K. (K.)
Aims: Sunspot activity is often hemispherically asymmetric, and during the Maunder minimum, activity was almost completely limited to one hemisphere. In this work, we use surface flux simulation to study how magnetic activity limited only to the sout
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=od______2423::739e549133cac7e63fe3fe734bf5812e
http://urn.fi/urn:nbn:fi-fe201902205813
http://urn.fi/urn:nbn:fi-fe201902205813